Inhabitant of a hospital?

Solution 1:

inmate:

any of a group occupying a single place of residence; especially : a person confined (as in a prison or hospital) (Merriam Webster)

In a hospital setting, the word currently has a strong connotation of referring to patients with mental disorders. It might sound strange if most of the people in the hospital are being held there for other reasons.

Vocabulary.com also has a short explanation of the meaning and connotations of the word, where it says "You can talk about a hospital inmate or the inmates at a local boarding school, but it's most common to use inmate and prisoner interchangeably."

Solution 2:

Inpatient:

• A patient who is admitted to a hospital or clinic for treatment that requires at least one overnight stay.

(AHD)

Solution 3:

I'm not sure "inmate" - the accepted answer - is the typical English term. At least not for Britsh English. A more typical term, particularly for First World War would be "resident patient".

There is even a Sherlock Holmes story titled The Adventure of the Resident Patient.

Solution 4:

'Patient(s)' would probably be the best word - see dictionary.